Question about Lexmark T640 Laser Printer
Networked Lexmark T640 used to print envelopes through the MP feeder. For some unknown reason when you send an envelope job from Word it will now print out pages and pages of paper with symbols across the top line only or, it will print the address for the envelope onto a piece of cassette paper - bypassing the envelope loaded on the MP feeder. Any ideas?
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Posted on Jan 02, 2017
Make sure the paper type for the tray from which you print envelope is set to Envelope. If the printer doesn't know that an envelope is being printed, it will not turn on the "Envelope Enhance" feature. The Envelope Enhance feature pumps air out of the envelope before it enters the fuser and can prevent creasing in the envelope. However, keep in mind that any envelopes larger than a US Size 10 will most likely crinkle, with or without the Envelope Enhance
Posted on Feb 06, 2009
You can load up to 10 envelopes in the standard tray. Try a sample of any envelopes you are
considering using with the printer before buying large quantities. See Loading envelopes in the
standard tray for instructions on loading envelopes.
When printing on envelopes:
• To achieve the best possible print quality, use only high-quality envelopes that are designed
for use in laser printers.
• Set the Paper Source in the Paper Menu based on the source you are using, set the Paper
Type to Envelope, and select the correct envelope size from the operator panel, the printer
driver, or from MarkVision Professional.
• For best performance, use envelopes made from 90 g/m2 (24 lb bond) paper. You can use up
to 105 g/m2 (28 lb bond) weight for the 250-sheet standard tray or 105 g/m2 (28 lb bond)
weight for envelopes as long as the cotton content is 25% or less. Envelopes with 100%
cotton content must not exceed 90 g/m2 (24 lb bond) weight.
• Use only new, undamaged envelopes.
• For best performance and to minimize jams, do not use envelopes that:
– Have excessive curl or twist.
– Are stuck together or damaged in any way.
– Contain windows, holes, perforations, cutouts or embossing.
– Use metal clasps, string ties, or metal folding bars.
– Have an interlocking design
– Have postage stamps attached
– Have any exposed adhesive when the flap is in the sealed or closed position
– Have nicked edges or bent corners
– Have rough, cockle, or laid finishes
• Use envelopes that can withstand temperatures of 170°C (338°F) without sealing, excessive
curling, wrinkling, or releasing hazardous emissions. If you have any doubts about the
envelopes you are considering using, check with the envelope supplier.
• Adjust the width guide to fit the width of the envelopes.
• Load only one size of envelope at a time in the tray. Envelopes may only be loaded in the
standard tray. Load them with the flap down and the flap to the left of the tray.
• A combination of high humidity (over 60%) and the high printing temperatures may seal the
Loading envelopes in the standard tray
The recommended stack height is 10 envelopes; however, in normal environments as many as 15
envelopes may be loaded. In high temperature or humidity environments, only seven envelopes
should be loaded.
1 Pull the standard tray completely out.
2 Squeeze the length guide tabs together as shown in step 2 on page 42. Slide the guide to
the correct position for the size of envelope you are loading.
3 Squeeze the width guide tabs as shown in step 3 on page 42. Slide the width guide to the
correct position for the size of envelope you are loading. Notice the size indicators on the
bottom left of the tray.
4 Push the envelope stack aid tabs toward each other. They snap into place.
5 Flex a stack of envelopes back and forth and then straighten the edges on a level surface.
Press down the corners to flatten them.
Fan the envelopes. This prevents the edges of the envelopes from sticking together and helps
them feed properly.
6 Load envelopes flap side down with the stamp area and flap on the right. The end of the envelope with the stamp area enters the printer first.
7 Insert the standard tray.
Posted on Apr 04, 2009
SOURCE: won't print envelopes in black
First you need to change the settings in the software you are trying to print the envelope. Open the program (for example MS Word), go to the option from which you print envelopes and labels. Set the font color to black, not "automatic", and in Word, click "default", which sets the color as black rather than allowing the printer or its software to select the wrong color. Then try to print on the envelope and let us know if you are able to print the envelope in black only.
Posted on Apr 14, 2009
SOURCE: My lexmark will print page, business cards, labels, pics, etc. But it will not print envelopes. Looks, sounds, and acts like its printing. But when it spits out the envelope nothing is printed on it.
There must be an issue with the size of the envelope the printer is expecting. If you're using Microsoft Word, check under "Letters and Mailings" and then "Evevolopes and Labels" to check the size you have set the envelope to. Perhaps its also a setting in File and Page Setup or in the printers own settings under Control Panel and Printers. Sorry for not being of more help but if its not jamming or giving an error then its probably just set to the wrong envelope size.
Posted on May 17, 2009
The problem that you are experiencing is caused by the way the text is formatted in most word processing documents. By default envelopes are printed not in black, but a dark gray. This confuses the printer and causes it to use the color cartridge to process gray instead of using the black cartridge.
You can fix this problem with one of two ways:
1. Click on "Start", "Control Panel" and click on "Printers and Faxes." Right click on the "Lexmark Printer" icon and select "Properties." Click on "Printing Preferences." Go to "Quality/Copies" tab and select the option "Print color images in black and white."
2. You can also change the color of you text to a true black in your word processor. This will require you to resort to the word processor's documentation and help files.
Both of these settings will cause your printer to use the black cartridge instead of the color. If either one of these solutions solves your problem, it means your color cartridge needs to be cleaned or replaced. If you feel that the color cartridge should not be out of ink, please follow the steps given below:
Clean Nozzle Procedure:
1. Go to the "Solution Center" and click on the "Maintenance" tab.
2. Select "Clean to fix horizontal strips."
The colors that you should see here are black, yellow, magenta (a reddish purple) and cyan (a dark sky blue). You should notice the diagonal lines above and below the solid horizontal lines. These diagonal lines should be solid from left to right with no gaps.
If there are gaps in the lines or the print diminishes across the page, you should run the "Clean Print Nozzles" page a couple more times to try and clear it up. If you still have gaps at the top and bottom, you should "wick" the cartridges by following the steps given below:
1. Select "Install color/black cartridge" and remove the cartridge from the printer.
2. Get a damp paper towel.
3. Set the ink cartridge right side up on the damp paper towel so that the ink nozzles are against the towel and hold the cartridge in this position for about 15 seconds.
4. Now wipe the print head (on the bottom where the ink comes out) across in one direction only (left to right) until it looks clean.
5. Next dab the cartridge on the towel to make sure that the ink is flowing.
6. Snap the cartridge back into the printer.
7. On your computer, select "Old Cartridge installed."
8. Repeat the "Clean to fix horizontal strips" procedure listed above.
If this procedure does not help, please let us know so that we can continue with technical support.
Posted on Oct 01, 2009
Testimonial: "Thank you. I was on the phone with Lexmark a whole hour last night and they couldn't fix it. This corrected the problem immediately! You are a Wiz"
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The printer will stop printing is there is an error, check for any paper jam before printing. Take note of the error message and locate the exact jam.
Use the manual feeder when printing on envelopes. You may click on the link http://bit.ly/rnHp5b to see instructions on how to go about the procedure using the manual feeder.
For further assistance, please call Lexmark Technical Support.
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